587 lines
23 KiB
Python
587 lines
23 KiB
Python
#!/usr/bin/env python3
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# CephInstance.py - Class implementing a PVC node Ceph instance
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# Part of the Parallel Virtual Cluster (PVC) system
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#
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# Copyright (C) 2018-2021 Joshua M. Boniface <joshua@boniface.me>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, version 3.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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###############################################################################
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import time
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import json
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import psutil
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import daemon_lib.common as common
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from distutils.util import strtobool
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from re import search
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class CephOSDInstance(object):
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def __init__(self, zkhandler, this_node, osd_id):
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self.zkhandler = zkhandler
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self.this_node = this_node
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self.osd_id = osd_id
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self.node = None
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self.size = None
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self.stats = dict()
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@self.zkhandler.zk_conn.DataWatch(self.zkhandler.schema.path('osd.node', self.osd_id))
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def watch_osd_node(data, stat, event=''):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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try:
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data = data.decode('ascii')
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except AttributeError:
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data = ''
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if data and data != self.node:
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self.node = data
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@self.zkhandler.zk_conn.DataWatch(self.zkhandler.schema.path('osd.stats', self.osd_id))
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def watch_osd_stats(data, stat, event=''):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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try:
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data = data.decode('ascii')
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except AttributeError:
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data = ''
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if data and data != self.stats:
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self.stats = json.loads(data)
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@staticmethod
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def add_osd(zkhandler, logger, node, device, weight, ext_db_flag=False, ext_db_ratio=0.05):
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# We are ready to create a new OSD on this node
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logger.out('Creating new OSD disk on block device {}'.format(device), state='i')
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try:
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# 1. Create an OSD; we do this so we know what ID will be gen'd
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retcode, stdout, stderr = common.run_os_command('ceph osd create')
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if retcode:
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print('ceph osd create')
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print(stdout)
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print(stderr)
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raise Exception
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osd_id = stdout.rstrip()
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# 2. Remove that newly-created OSD
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retcode, stdout, stderr = common.run_os_command('ceph osd rm {}'.format(osd_id))
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if retcode:
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print('ceph osd rm')
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print(stdout)
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print(stderr)
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raise Exception
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# 3a. Zap the disk to ensure it is ready to go
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logger.out('Zapping disk {}'.format(device), state='i')
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retcode, stdout, stderr = common.run_os_command('ceph-volume lvm zap --destroy {}'.format(device))
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if retcode:
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print('ceph-volume lvm zap')
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print(stdout)
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print(stderr)
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raise Exception
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dev_flags = "--data {}".format(device)
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# 3b. Prepare the logical volume if ext_db_flag
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if ext_db_flag:
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_, osd_size_bytes, _ = common.run_os_command('blockdev --getsize64 {}'.format(device))
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osd_size_bytes = int(osd_size_bytes)
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result = CephOSDInstance.create_osd_db_lv(zkhandler, logger, osd_id, ext_db_ratio, osd_size_bytes)
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if not result:
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raise Exception
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db_device = "osd-db/osd-{}".format(osd_id)
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dev_flags += " --block.db {}".format(db_device)
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else:
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db_device = ""
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# 3c. Create the OSD for real
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logger.out('Preparing LVM for new OSD disk with ID {} on {}'.format(osd_id, device), state='i')
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retcode, stdout, stderr = common.run_os_command(
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'ceph-volume lvm prepare --bluestore {devices}'.format(
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osdid=osd_id,
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devices=dev_flags
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)
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)
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if retcode:
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print('ceph-volume lvm prepare')
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print(stdout)
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print(stderr)
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raise Exception
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# 4a. Get OSD FSID
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logger.out('Getting OSD FSID for ID {} on {}'.format(osd_id, device), state='i')
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retcode, stdout, stderr = common.run_os_command(
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'ceph-volume lvm list {device}'.format(
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osdid=osd_id,
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device=device
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)
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)
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for line in stdout.split('\n'):
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if 'osd fsid' in line:
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osd_fsid = line.split()[-1]
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if not osd_fsid:
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print('ceph-volume lvm list')
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print('Could not find OSD fsid in data:')
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print(stdout)
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print(stderr)
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raise Exception
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# 4b. Activate the OSD
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logger.out('Activating new OSD disk with ID {}'.format(osd_id, device), state='i')
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retcode, stdout, stderr = common.run_os_command(
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'ceph-volume lvm activate --bluestore {osdid} {osdfsid}'.format(
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osdid=osd_id,
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osdfsid=osd_fsid
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)
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)
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if retcode:
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print('ceph-volume lvm activate')
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print(stdout)
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print(stderr)
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raise Exception
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# 5. Add it to the crush map
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logger.out('Adding new OSD disk with ID {} to CRUSH map'.format(osd_id), state='i')
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retcode, stdout, stderr = common.run_os_command(
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'ceph osd crush add osd.{osdid} {weight} root=default host={node}'.format(
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osdid=osd_id,
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weight=weight,
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node=node
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)
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)
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if retcode:
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print('ceph osd crush add')
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print(stdout)
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print(stderr)
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raise Exception
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time.sleep(0.5)
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# 6. Verify it started
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retcode, stdout, stderr = common.run_os_command(
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'systemctl status ceph-osd@{osdid}'.format(
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osdid=osd_id
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)
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)
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if retcode:
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print('systemctl status')
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print(stdout)
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print(stderr)
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raise Exception
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# 7. Add the new OSD to the list
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logger.out('Adding new OSD disk with ID {} to Zookeeper'.format(osd_id), state='i')
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zkhandler.write([
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(('osd', osd_id), ''),
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(('osd.node', osd_id), node),
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(('osd.device', osd_id), device),
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(('osd.db_device', osd_id), db_device),
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(('osd.stats', osd_id), '{}'),
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])
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# Log it
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logger.out('Created new OSD disk with ID {}'.format(osd_id), state='o')
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return True
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except Exception as e:
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# Log it
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logger.out('Failed to create new OSD disk: {}'.format(e), state='e')
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return False
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@staticmethod
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def remove_osd(zkhandler, logger, osd_id, osd_obj):
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logger.out('Removing OSD disk {}'.format(osd_id), state='i')
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try:
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# 1. Verify the OSD is present
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retcode, stdout, stderr = common.run_os_command('ceph osd ls')
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osd_list = stdout.split('\n')
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if osd_id not in osd_list:
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logger.out('Could not find OSD {} in the cluster'.format(osd_id), state='e')
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return True
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# 1. Set the OSD out so it will flush
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logger.out('Setting out OSD disk with ID {}'.format(osd_id), state='i')
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retcode, stdout, stderr = common.run_os_command('ceph osd out {}'.format(osd_id))
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if retcode:
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print('ceph osd out')
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print(stdout)
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print(stderr)
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raise Exception
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# 2. Wait for the OSD to flush
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logger.out('Flushing OSD disk with ID {}'.format(osd_id), state='i')
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osd_string = str()
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while True:
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try:
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retcode, stdout, stderr = common.run_os_command('ceph pg dump osds --format json')
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dump_string = json.loads(stdout)
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for osd in dump_string:
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if str(osd['osd']) == osd_id:
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osd_string = osd
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num_pgs = osd_string['num_pgs']
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if num_pgs > 0:
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time.sleep(5)
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else:
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raise Exception
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except Exception:
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break
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# 3. Stop the OSD process and wait for it to be terminated
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logger.out('Stopping OSD disk with ID {}'.format(osd_id), state='i')
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retcode, stdout, stderr = common.run_os_command('systemctl stop ceph-osd@{}'.format(osd_id))
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if retcode:
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print('systemctl stop')
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print(stdout)
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print(stderr)
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raise Exception
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# FIXME: There has to be a better way to do this /shrug
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while True:
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is_osd_up = False
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# Find if there is a process named ceph-osd with arg '--id {id}'
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for p in psutil.process_iter(attrs=['name', 'cmdline']):
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if 'ceph-osd' == p.info['name'] and '--id {}'.format(osd_id) in ' '.join(p.info['cmdline']):
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is_osd_up = True
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# If there isn't, continue
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if not is_osd_up:
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break
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# 4. Determine the block devices
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retcode, stdout, stderr = common.run_os_command('readlink /var/lib/ceph/osd/ceph-{}/block'.format(osd_id))
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vg_name = stdout.split('/')[-2] # e.g. /dev/ceph-<uuid>/osd-block-<uuid>
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retcode, stdout, stderr = common.run_os_command('vgs --separator , --noheadings -o pv_name {}'.format(vg_name))
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pv_block = stdout.strip()
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# 5. Zap the volumes
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logger.out('Zapping OSD disk with ID {} on {}'.format(osd_id, pv_block), state='i')
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retcode, stdout, stderr = common.run_os_command('ceph-volume lvm zap --destroy {}'.format(pv_block))
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if retcode:
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print('ceph-volume lvm zap')
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print(stdout)
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print(stderr)
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raise Exception
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# 6. Purge the OSD from Ceph
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logger.out('Purging OSD disk with ID {}'.format(osd_id), state='i')
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retcode, stdout, stderr = common.run_os_command('ceph osd purge {} --yes-i-really-mean-it'.format(osd_id))
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if retcode:
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print('ceph osd purge')
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print(stdout)
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print(stderr)
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raise Exception
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# 7. Remove the DB device
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if zkhandler.exists(('osd.db_device', osd_id)):
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db_device = zkhandler.read(('osd.db_device', osd_id))
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logger.out('Removing OSD DB logical volume "{}"'.format(db_device), state='i')
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retcode, stdout, stderr = common.run_os_command('lvremove --yes --force {}'.format(db_device))
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# 8. Delete OSD from ZK
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logger.out('Deleting OSD disk with ID {} from Zookeeper'.format(osd_id), state='i')
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zkhandler.delete(('osd', osd_id), recursive=True)
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# Log it
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logger.out('Removed OSD disk with ID {}'.format(osd_id), state='o')
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return True
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except Exception as e:
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# Log it
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logger.out('Failed to purge OSD disk with ID {}: {}'.format(osd_id, e), state='e')
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return False
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@staticmethod
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def add_db_vg(zkhandler, logger, device):
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logger.out('Creating new OSD database volume group on block device {}'.format(device), state='i')
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try:
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# 0. Check if an existsing volume group exists
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retcode, stdout, stderr = common.run_os_command(
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'vgdisplay osd-db'
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)
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if retcode != 5:
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logger.out('Ceph OSD database VG "osd-db" already exists', state='e')
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return False
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# 1. Create an empty partition table
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logger.out('Creating partitons on block device {}'.format(device), state='i')
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retcode, stdout, stderr = common.run_os_command(
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'sgdisk --clear {}'.format(device)
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)
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if retcode:
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print('sgdisk create partition table')
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print(stdout)
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print(stderr)
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raise Exception
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retcode, stdout, stderr = common.run_os_command(
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'sgdisk --new 1:: --typecore 1:8e00 {}'.format(device)
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)
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if retcode:
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print('sgdisk create pv partition')
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print(stdout)
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print(stderr)
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raise Exception
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# Handle the partition ID portion
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if search(r'by-path', device) or search(r'by-id', device):
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# /dev/disk/by-path/pci-0000:03:00.0-scsi-0:1:0:0 -> pci-0000:03:00.0-scsi-0:1:0:0-part1
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partition = '{}-part1'.format(device)
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elif search(r'nvme', device):
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# /dev/nvme0n1 -> nvme0n1p1
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partition = '{}p1'.format(device)
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else:
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# /dev/sda -> sda1
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# No other '/dev/disk/by-*' types are valid for raw block devices anyways
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partition = '{}1'.format(device)
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# 2. Create the PV
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logger.out('Creating PV on block device {}'.format(partition), state='i')
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retcode, stdout, stderr = common.run_os_command(
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'pvcreate --force {}'.format(partition)
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)
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if retcode:
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print('pv creation')
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print(stdout)
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print(stderr)
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raise Exception
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# 2. Create the VG (named 'osd-db')
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logger.out('Creating VG "osd-db" on block device {}'.format(partition), state='i')
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retcode, stdout, stderr = common.run_os_command(
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'vgcreate --force osd-db {}'.format(partition)
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)
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if retcode:
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print('vg creation')
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print(stdout)
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print(stderr)
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raise Exception
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# Log it
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logger.out('Created new OSD database volume group on block device {}'.format(device), state='o')
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return True
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except Exception as e:
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# Log it
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logger.out('Failed to create OSD database volume group: {}'.format(e), state='e')
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return False
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@staticmethod
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def create_osd_db_lv(zkhandler, logger, osd_id, ext_db_ratio, osd_size_bytes):
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logger.out('Creating new OSD database logical volume for OSD ID {}'.format(osd_id), state='i')
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try:
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# 0. Check if an existsing logical volume exists
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retcode, stdout, stderr = common.run_os_command(
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'lvdisplay osd-db/osd{}'.format(osd_id)
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)
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if retcode != 5:
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logger.out('Ceph OSD database LV "osd-db/osd{}" already exists'.format(osd_id), state='e')
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return False
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# 1. Determine LV sizing
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osd_db_size = int(osd_size_bytes * ext_db_ratio / 1024 / 1024)
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# 2. Create the LV
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logger.out('Creating DB LV "osd-db/osd-{}" of {}M ({} * {})'.format(osd_id, osd_db_size, osd_size_bytes, ext_db_ratio), state='i')
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retcode, stdout, stderr = common.run_os_command(
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'lvcreate --yes --name osd-{} --size {} osd-db'.format(osd_id, osd_db_size)
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)
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if retcode:
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print('db lv creation')
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print(stdout)
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print(stderr)
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raise Exception
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# Log it
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logger.out('Created new OSD database logical volume "osd-db/osd-{}"'.format(osd_id), state='o')
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return True
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except Exception as e:
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# Log it
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logger.out('Failed to create OSD database logical volume: {}'.format(e), state='e')
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return False
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class CephPoolInstance(object):
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def __init__(self, zkhandler, this_node, name):
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self.zkhandler = zkhandler
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self.this_node = this_node
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self.name = name
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self.pgs = ''
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self.stats = dict()
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@self.zkhandler.zk_conn.DataWatch(self.zkhandler.schema.path('pool.pgs', self.name))
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def watch_pool_node(data, stat, event=''):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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try:
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data = data.decode('ascii')
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except AttributeError:
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data = ''
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if data and data != self.pgs:
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self.pgs = data
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@self.zkhandler.zk_conn.DataWatch(self.zkhandler.schema.path('pool.stats', self.name))
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def watch_pool_stats(data, stat, event=''):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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try:
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data = data.decode('ascii')
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except AttributeError:
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data = ''
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if data and data != self.stats:
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self.stats = json.loads(data)
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class CephVolumeInstance(object):
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def __init__(self, zkhandler, this_node, pool, name):
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self.zkhandler = zkhandler
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self.this_node = this_node
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self.pool = pool
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self.name = name
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self.stats = dict()
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@self.zkhandler.zk_conn.DataWatch(self.zkhandler.schema.path('volume.stats', f'{self.pool}/{self.name}'))
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def watch_volume_stats(data, stat, event=''):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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try:
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data = data.decode('ascii')
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except AttributeError:
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data = ''
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|
|
if data and data != self.stats:
|
|
self.stats = json.loads(data)
|
|
|
|
|
|
class CephSnapshotInstance(object):
|
|
def __init__(self, zkhandler, this_node, pool, volume, name):
|
|
self.zkhandler = zkhandler
|
|
self.this_node = this_node
|
|
self.pool = pool
|
|
self.volume = volume
|
|
self.name = name
|
|
self.stats = dict()
|
|
|
|
@self.zkhandler.zk_conn.DataWatch(self.zkhandler.schema.path('snapshot.stats', f'{self.pool}/{self.volume}/{self.name}'))
|
|
def watch_snapshot_stats(data, stat, event=''):
|
|
if event and event.type == 'DELETED':
|
|
# The key has been deleted after existing before; terminate this watcher
|
|
# because this class instance is about to be reaped in Daemon.py
|
|
return False
|
|
|
|
try:
|
|
data = data.decode('ascii')
|
|
except AttributeError:
|
|
data = ''
|
|
|
|
if data and data != self.stats:
|
|
self.stats = json.loads(data)
|
|
|
|
|
|
# Primary command function
|
|
# This command pipe is only used for OSD adds and removes
|
|
def ceph_command(zkhandler, logger, this_node, data, d_osd):
|
|
# Get the command and args
|
|
command, args = data.split()
|
|
|
|
# Adding a new OSD
|
|
if command == 'osd_add':
|
|
node, device, weight, ext_db_flag, ext_db_ratio = args.split(',')
|
|
ext_db_flag = bool(strtobool(ext_db_flag))
|
|
ext_db_ratio = float(ext_db_ratio)
|
|
if node == this_node.name:
|
|
# Lock the command queue
|
|
zk_lock = zkhandler.writelock('base.cmd.ceph')
|
|
with zk_lock:
|
|
# Add the OSD
|
|
result = CephOSDInstance.add_osd(zkhandler, logger, node, device, weight, ext_db_flag, ext_db_ratio)
|
|
# Command succeeded
|
|
if result:
|
|
# Update the command queue
|
|
zkhandler.write([
|
|
('base.cmd.ceph', 'success-{}'.format(data))
|
|
])
|
|
# Command failed
|
|
else:
|
|
# Update the command queue
|
|
zkhandler.write([
|
|
('base.cmd.ceph', 'failure-{}'.format(data))
|
|
])
|
|
# Wait 1 seconds before we free the lock, to ensure the client hits the lock
|
|
time.sleep(1)
|
|
|
|
# Removing an OSD
|
|
elif command == 'osd_remove':
|
|
osd_id = args
|
|
|
|
# Verify osd_id is in the list
|
|
if d_osd[osd_id] and d_osd[osd_id].node == this_node.name:
|
|
# Lock the command queue
|
|
zk_lock = zkhandler.writelock('base.cmd.ceph')
|
|
with zk_lock:
|
|
# Remove the OSD
|
|
result = CephOSDInstance.remove_osd(zkhandler, logger, osd_id, d_osd[osd_id])
|
|
# Command succeeded
|
|
if result:
|
|
# Update the command queue
|
|
zkhandler.write([
|
|
('base.cmd.ceph', 'success-{}'.format(data))
|
|
])
|
|
# Command failed
|
|
else:
|
|
# Update the command queue
|
|
zkhandler.write([
|
|
('base.cmd.ceph', 'failure-{}'.format(data))
|
|
])
|
|
# Wait 1 seconds before we free the lock, to ensure the client hits the lock
|
|
time.sleep(1)
|
|
|
|
# Adding a new DB VG
|
|
elif command == 'db_vg_add':
|
|
node, device = args.split(',')
|
|
if node == this_node.name:
|
|
# Lock the command queue
|
|
zk_lock = zkhandler.writelock('base.cmd.ceph')
|
|
with zk_lock:
|
|
# Add the VG
|
|
result = CephOSDInstance.add_db_vg(zkhandler, logger, device)
|
|
# Command succeeded
|
|
if result:
|
|
# Update the command queue
|
|
zkhandler.write([
|
|
('base.cmd.ceph', 'success-{}'.format(data))
|
|
])
|
|
# Command failed
|
|
else:
|
|
# Update the command queue
|
|
zkhandler.write([
|
|
('base.cmd.ceph', 'failure={}'.format(data))
|
|
])
|
|
# Wait 1 seconds before we free the lock, to ensure the client hits the lock
|
|
time.sleep(1)
|